Dynamics of Genetic Differentiation in the Río Negro Tuco-tuco (<i>Ctenomys rionegrensis</i>) at the Local and Geographical Scales

Enrique P. Lessa, Gabriela Wlasiuk and John Carlos Garza

in Mammalian Diversification

Published by University of California Press

Published in print January 2006 | ISBN: 9780520098534
Published online March 2012 | e-ISBN: 9780520916098 | DOI:
Dynamics of Genetic Differentiation in the Río Negro Tuco-tuco (Ctenomys rionegrensis) at the Local and Geographical Scales

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This chapter examines the patterns of genetic variation within the Río Negro tuco-tuco Ctenomys rionegrensis, which is distinguished by an unusual pattern of coat color polymorphism. It analyzes genetic population structure, and evaluates the likelihood of the local fixation of melanism by random genetic drift using microsatellite allele frequencies and cytochrome b gene sequences. The chapter provides evidence that this species has undergone a historical range expansion followed by differentiation of relatively isolated local populations.

Keywords: tuco-tuco; Ctenomys rionegrensis; genetic variation; coat color; polymorphism; melanism; microsatellite allele; cytochrome b gene; range expansion; genetic population

Chapter.  6071 words.  Illustrated.

Subjects: Zoology and Animal Sciences

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